Paddle mechanism for circulating molten glass



A. F. MCNISH PADDLFT MECHANISM FOR CIRCULATING MOLTEN GLASS -Filed April l2, 1929 Feb. lo, 1931 l 'mail .llllilh Patented Feb. 10, 1931 UNITED STATES PATENT OFFICE ALEXANDER FRANCIS McNIsH, or PERTH, SCOTLAND, AssrGNoa or ONE-HALF rro Y JOHN MONCRIEFF Lit/irren, or PERTH, SCOTLAND PADDLE MECHANISM FOR CRCULATING MOLTEN GIL/ASS Application filed April 12, 1929, Serial No. 354,575, and in Great Britain .Tune 1, 19,28.

This invention has. reference to improved paddle mechanism for circulating molten glass through the fore-hearth of a glass furnalc'e or through any similar trough or channe the paddle holder on a horizontal fulcrum which is reciprocated vertically toiraise. and.

lower the paddle and to'cause it to dip into 10 the glass, whilst mechanism is providedto rock the paddle to and fro so that it travels in one direction in the glass and returns when raised out of the glass. By this construction paddle mechanism according to this inven tion. f Fig. 1 is a vertical sectional view. Fig. 2 is a view at right angles thereto, showing the 25 orehearth in section. Fig. 3 is a plan v iew. The .paddle 4 has a shank 5 which is carried by a paddle holder 6. The fulcrum consists of a pin 7 on the paddle holder journalled in a slide 8 guided vertically and re-` 30 ciprocated bv means of a rotating cam 10.

The paddle holder 6 is oscillated about its ulcrum 7 bv means of a` crank pin llwhichv works in a s'lot 12 in the paddle holder.

The cam 10 is shaped to give the desired vertical stroke to the paddle 4 and preferably coacts with a roller 13 adj ustably or otherwise mounted on the slide 8 which maybe guided by means of fixed vertical guide rods 9 passing through cross heads 14 on the slide 8.

T he throw of the crank-pin 11 determines the stroke ot the paddle 4in a horizontal direction and the cam 10 and crank-pin 11 are so situated in relation to one another that the paddle 4 is first dipped into the glass, then rocked in one direction about its fulcrum 7 to move the paddle through the glass in the trough or forehearth, whereupon the paddle 4 is raised' out ofthe glass an'd finally rocked back again about its fulcrum 7. s

' Thepaddle holder 6 is preferably of 1n- The present invention consists in mounting verted L-shape, its*shorterhorizontal limb supporting the core rod 15 of la clay or other refractory paddle which passes through a conical opening 16 formed in a block 17 of vclay or other refractory material which closes the opening 18 in the cover 190i the forehearth 20. The vertical limb of the paddle holder 6 is provided at a short distance from its upper end with the projecting horizontal fulcrum -pin7 and'is formed at its lower end with the verticalslot 12 which c0 operates with the crank pin 11 conveniently mounted on one sideof the cam 10. .A The roller 13 may be adjustably mounted on the slide 8 by fitting, itl on a back plate 21 C3 adjustably bolted to the slide 8.. I l

The cam 1Q is mounted `on a cam shaft 22 f which is rotated by any convenient means and the caml 10 is shaped to givethe desired. height of stroke anddip-ping movement. It' will be noted also that the` mechanism can bearranged outside ythe forehearth so that the paddle holder overhangs the outside wall of the 'forehearth Claims: Y

l. Mechanism for circulating molt-en glass through a trough comprising a paddle, a holder for supporting the paddle in Lthe trough, a horizontal fulcrum for the paddle holder, means `for reciprocating the fulcrum Q in a rectilinear vertical path, and means for rocking the holder about its Jr`ulcrum.

2. The combination with a molten glass circulating trough of a cover for the trough, said cover having an aperture therein, a padi dle having a shank extending through said aperture, a holder attached to the shank oi' the paddle, a horizontal fulcrum for said holder, means for rocking the holder about its fulcrum and means' for vertically reciprocating the fulcrum, said fulcrum being situated close to the level of said aperture so as to permit of the ,provision of only a small clearance between said aperture and the paddle shank.

3. A glass circulating trough having mechf anism as specified in claim 2 wherein the fulcrum is situated just above the level of the aperture in the cover of the trough when the paddle is at its maximum height.

4. Mechanism for circulating molten glass 130 through a trough Vcomprising a paddle, a holder for supporting the paddle 1n the trough, a horizontal fulcrum for the paddle holder, a vertically-guided rectilinearly movable slide supporting said fulcrum, and a rotary element for reciprocating said slide, said rotary element cooperating with the paddle holder to rock the latter about the fulcrum.

5. Mechanism for circulating molten glass through a trough comprising a paddle, a holder for supporting the paddle in the trough, a horizontal fulcrum for the paddle holder, a vertically-guided rectilinearly movable slide supporting said fulcrum, a rotary cam for reciprocating the slide and a rotary crank for rocking the paddle holder about its fulcrum.

G. Mechanism for circulating molten glass through a trough comprising a paddle, a holder for supporting the paddle in the trough, a horizontal fulcrum for the paddle holder, a vertically-guided rectilinearly movable slide supporting said fulcrum, a-rotary cam for reciprocating the slide and a crank `pin on said cam, said crank-pin cooperating with a slot in the paddle holder, to rock said paddle holder about said fulcrum.

7. Mechanism as specified in claim 4 wherev in the rotary element cooperates with an adt 30 justable member on the slide. y

8. Mechanism for circulating molten glass through a trough comprising a paddle, a pad? dle 'holder consisting of a horizontalv limb for supporting the paddle, aV vertical member supporting saidl limb, ,a horizontal fulcrum for said member, means for reciprocating said ,fulcrum in a rectilinear vertical path, and

means \for rocking said member Vabout its ulcrum.

9. Mechanism for circulating molten glass through a trough comprisingna paddle, a

paddle holder overhanging' `the' trough, a

slotted vertical member supporting said holder, a ulcrum pin extending horizontally from said member, a vertically-guided slide -in which said pin is journalled,` a rotary cam for reciprocating said slide, and a .rotary crank-pin cooperating with the slotted member to rock the paddle holder.

I n testimony whereof I have aixed my signature.

ALEXANDER FRANCIS MCNISH. 

